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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2*y)/4 = 32/y // - 32/y
(2*y)/4-(32/y) = 0
(2*y)/4-32*y^-1 = 0
1/2*y^1-32*y^-1 = 0
(1/2*y^2-32*y^0)/(y^1) = 0 // * y^2
y^1*(1/2*y^2-32*y^0) = 0
y^1
(1/2)*y^2-32 = 0
(1/2)*y^2-32 = 0
DELTA = 0^2-(-32*4*(1/2))
DELTA = 64
DELTA > 0
y = (64^(1/2)+0)/(2*(1/2)) or y = (0-64^(1/2))/(2*(1/2))
y = 8 or y = -8
y in { -8, 8}
y in { -8, 8 }
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